strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. We expect fw_version strings to be NUL-terminated based on other similar assignments: wireless/broadcom/brcm80211/brcmsmac/main.c 7867: snprintf(wlc->wiphy->fw_version, 7868: sizeof(wlc->wiphy->fw_version), "%u.%u", rev, patch); wireless/broadcom/b43legacy/main.c 1765: snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u", wireless/broadcom/b43/main.c 2730: snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u", wireless/intel/iwlwifi/dvm/main.c 1465: snprintf(priv->hw->wiphy->fw_version, 1466: sizeof(priv->hw->wiphy->fw_version), wireless/intel/ipw2x00/ipw2100.c 5905: snprintf(info->fw_version, sizeof(info->fw_version), "%s:%d:%s", Based on this, NUL-padding is not required. A suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on the destination buffer without unnecessarily NUL-padding. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@xxxxxxxxxxxxxxx Signed-off-by: Justin Stitt <justinstitt@xxxxxxxxxx> --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/net/wireless/ti/wlcore/main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ti/wlcore/main.c b/drivers/net/wireless/ti/wlcore/main.c index bf21611872a3..52a427bd54fa 100644 --- a/drivers/net/wireless/ti/wlcore/main.c +++ b/drivers/net/wireless/ti/wlcore/main.c @@ -1126,7 +1126,7 @@ int wl1271_plt_start(struct wl1271 *wl, const enum plt_mode plt_mode) /* update hw/fw version info in wiphy struct */ wiphy->hw_version = wl->chip.id; - strncpy(wiphy->fw_version, wl->chip.fw_ver_str, + strscpy(wiphy->fw_version, wl->chip.fw_ver_str, sizeof(wiphy->fw_version)); goto out; @@ -2344,7 +2344,7 @@ static int wl12xx_init_fw(struct wl1271 *wl) /* update hw/fw version info in wiphy struct */ wiphy->hw_version = wl->chip.id; - strncpy(wiphy->fw_version, wl->chip.fw_ver_str, + strscpy(wiphy->fw_version, wl->chip.fw_ver_str, sizeof(wiphy->fw_version)); /* --- base-commit: 58720809f52779dc0f08e53e54b014209d13eebb change-id: 20231018-strncpy-drivers-net-wireless-ti-wlcore-main-c-c0c28a2ffb0f Best regards, -- Justin Stitt <justinstitt@xxxxxxxxxx>
